Mounting for the tooth rest of cutter grinders



Dec. 1, 1931. w E w s I 1,834,816

MOUNTING FOR THE TOOTH REST OF CUTTER GRINDERS Filed March 17, 1930INVENTOR. Mum/14E M/V/l N5,

A TTORNE Y.

Patented Dec. 1, 1931 PATENT OFFICE WILLIAM E. WINAN S, OF HARRISBURG,PENNSYLVANIA MOUNTING FOR THE TOOTH REST OF CUTTER GRINDERS Applicationfiled March 17, 1930.

The invention is for an improved mounting for that part of tool andcutter grlnders known as the tooth rest and is more applicable to a toolgrinder when the grinding of a milling cutter reamer or the like is tobe accomplished by the meet a cup wheel or flared cup wheel, although itmay also be used advantageously with a disc Wheel, usmgthe peripherythereof for the grinding operation.

in In'devices of this kind as at present constructed, it is a tediousand time consuming operation to so adjust a tool with relation to thegrinding element as to give the desired clearance angle to the cuttingedge of the 1:. tooth of the tool being ground, it being necessary forthe workman to first consult a clearance table which is usually providedby the manufacturer of the tool grinder being used, to determine theadjustment of the tooth rest with relation to the axis of the arbor onwhich the tool. is mounted for grinding. This adjustment varies with thediameter of the tool and the clearance angle desired and is usuallyexpressed in the clearance table in decimals 2:. of an inch, which theWorkman must translate into such fractional elements of an inch as bereadily measured with a machinist rule or scale, then by scalemeasurement he must adjust the tool rest with relation to the axis ofthe arbor in such manner as to properly position the work with relationto the grinding element to give the desired clearance. Not only is thismode or procedure time consuming'and tedious but is fraught 5 with thedanger of damage to a tool resulting from mal-adjustment of the toolwith relation to the grinding element.

The primary object of the invention is to provide a tooth rest mountingso calibrated 44) in degrees of angularity that the tooth rest fingerper so may be readily and accurately set for grinding the tooth of atool to any desired clearance angle, thus avoiding the necessity ofconsulting a clearance table or 4 resorting to scale measurements.

It is a further object of the invention to i provide a device of thecharacter indicated which when set to impart a given angle of clearanceto a tooth, may be used for impartdo ing a clearance of like angularityto the tooth Serial No. 436,451.

of tools of varying diameters without the necessity of re-setting.

it is a further object of the invention to provide a device of thecharacter indicated that is adaptable to use for all standard types 5 oftool and cutter grinders.

It is a further object of the invention to provide a device of thecharacter indicated which is simple in construction and operation andone that can be used by an unskilled oo' workman.

In the accompanying drawings Figure l'is a side elevation of theimproved tool rest mounting.

Figure2 is an end View thereof taken at right angles "to Figure 1.

Figure 3 is a side elevation of a modified form of the invention showingthe tooth rest finger supported from a point above the axis of the arborsupporting the work.

Figure t is an end view of Figure 3 taken at right angles thereto.

In the embodiment of the invention as illustrated in the drawings, thesupporting base 10 is provided with slot 11 having inwardly beveledwallsl2 for cooperation with complementary beveled walls 13 of platen 14for longitudinal slidable movement of the base 10 on the platen 14 foradjustment longitudinally of the platen 1 1 of the tooth rest fingerwith relation to the tool to be ground. Base 10 is provided with tensionscrew 15 having knurled head 16 for securing the base in adjustedposition with relation to the platen 14.. Base 10 has an arcuate cutaway 35 portion forming slideway 17 for slidably receiving thereinsegment 18. The slideway 17 has inwardly sloping wall 19 which lies atan angle of less than to the bottom 20 there.-

of thus forming an angular seat for the com- 90 plementary formed sideand bottom of segment 18 for sliding movement either clockwise or contraclock wise within the slidcway. Segment l8 terminates at its lower endin tooth rest supporting bar 21 which carries adjustable tooth rest base22 from the upper end of which projects the tooth rest supporting fingerper se 24. The lower portion of the tooth rest supporting base 22 issplit as at 23 for the adjustment inwardly or out- 'ment is brought'intoregistration with thewardly of the tooth rest finger per se 24-0-11 thearm 21 by means of tension screw 25. The tooth rest finger per se 24 ispreferably made ofa strip of machine spring steel of suitable thicknessin order that it may yield when passed from one tooth to the next inadjusting the finger to the tooth to'be ground. Segment 18 hasdownwardly and inwardly inclined face 26 which is calibrated as at 27 indegrees of angularity which indicate the de gree of angularity at whichthe tooth of a tool will be ground when the degree on the segzero markon the base 10 by sliding the segment within the slideway. Base 10 isprovided with clamp 28 having downwardly and inwardly extending portion7 29 conforming to the downwardly and inwardly inclined face of segment18 for clamping the segment 18 in adjusted position by means of tensionscrewBO. i V

In Figures 3 and 4. is shown a modification of the invention as shown inFigures 1 and 2',

in which thedevice is shown as being. of an over slung type, or ne inwhich the tooth rest Y supporting finger per se is supported and de-vpends from a point above the arbor of the mandrel upon which the work issupported and in which modification of the device, the segment 31describesthe half ofa circle, the upper end of which is provided with asplit clamping member 32 which" is bored aslat 33 forreceiving thereinin slidable movement the finger rest supporting arm 3 which car- -riesat its outer extremity oil set arm 35 for supporting the fingerrest per'se. Support ing arm 36 in off set relation to the arm 34 in order thatthe tool tooth rest supporting arm per se may be adjusted to the toothof a tool whose radius is greater than the radius of segment 31 by sopositioning base 10 ton:

platen Has to clear the segment 8i bythe end ofthe tool; V Itisessential in both and that it beso calibrated that at zerosetting thesupporting tip of the "tooth rest per se ishall be-in the samehorizontalplane with the wzplaten, a base having an arcuateslideway formed thereinand slidable longitudinally of the platen, a calibrated segment slidablein the slideway, andan adjustable tooth'rest supported by the segment.

thereinand slidable longitudinally of the platen, a calibrated segmentslidable in the wlslideway and a tooth restlsuppor'ted by the I I formsof the device that the axis of rotation of the segment shall; coincidewith the axis otthe arbor supporting the work, such, as a cutter,reamer,orthe like segment and adjustable with relation to the longitudinal axisof the arbor.

3. A tooth rest mounting comprising a platen, an arcuate tooth restsupporting mem ber slidably related to the platen, an arbor supported bythe platen and concentric with the tooth rest supporting member and atooth rest carried jby'the arcuate member. 7

4L. tooth rest mounting comprising a platen, a base having an arcuateslot therein lying transversely of'theplaten, said base being slidablelongitudinally of the platen, an arcuate tooth rest supporting armslidable. in the slot and a .to othrest finger supported by the" arm.

5. tooth rest mounting comprising a platen, an arborsupported by theplaten, anarcuate tooth. rest supporting member slidably related totheplaten, theaxis of the slidable member and the longitudinal axis ofthe arbor lying in the same vertical plane, a tooth rest carried by thearcuate member and means: for securing the} arcuate member againstslidable movement.

6. A tooth grest. mounting, comprising a platen, a supporting base, saidbase having an arcuate 'slideway therein, anarcuate tooth restsupporting member describing a semi circleand slidable in the. slideway,aclamping member carried by the arcuate support ingmember, saidcl'ampingmember and said supporting, memberhaving a communicating boreextending therethrough, a tooth rest supporting rod extendingthrough'the bore, and a tooth rest finger carried by the rod.

7. A tooth rest mounting comprising a platen, a ,supportingbase, saidbase having an arcuate slideway therein, an arcuate tooth rest.supporting member describing a semicircle and slidablelin the slideway,aclamping'member carriedbythe arcuate supportingmember, said clampingmember and said supporting member having a communicating bore extendingtherethrough, a tooth rest supporting arm extending through the bore, anoffset arm carried by the supporting arm and a tooth rest finger:affixedto the offset arm.

8. A tooth rest .mounting comprising a platen, a supporting base, saidbase having an arcuate slideway therein; an arcuate toot-h restsupporting member describing 'a semicircle and slidable in thefslideway,a clamping membercarrled the arcuate supporting member, said clampingmember and said sup porting member, having a communicating boreextendmgtherethrough, a-tooth rest 1 supporting armextending through the bore,

an offset arm carried by the supportingarm,

, v va--tooth.;restfinger aflixed to the offset arm- 2 2. A tooth restmounting comprising a.

and an arbor supported by :the platen having its longitudinal axisconcentric with the axis of theslidable member;

In testimony whereof .I have my hand. 7 i i WILLIAM E. VVIN'ANSJ,

hereunto set

